Wheeled scraper



Aug. 24 1926.

F. G. LEWIS WHEELED SCRAPER Filed Dec. 22, 1924 2 Sheets-Sheet 1 lPatentedAug. 24,

.UNITED STATES PATENT oFFicE.

runnen e. Lnwrs,

WEEELED SCBAPEB.

application mea December se, i924. semina.. 157,574..

to provide for the lmore convenient and eficient management ofsuch Scrapers in loading, transporting the load, and dumping the same.

The invention comprises improved mour 1t ing and carrying apparatus and dumping means, and a hydraulic lift for the scra er, whereby it may be easily and very quic 'y .elevated to a position for carrying the load,

even while moving forward, and4 against heavy resistance.

The invention is fully disclosed in the 'description and claims following, reference beingA had to the accompanying drawings, in which Fig. 1 is a side elevation illustrating two scrapers entrain, and attached to the rear of a tractor. Fig. 2 is a plan view in part of what is shown in Fig. 1. 'Fig 3I is a central, longitudinal sectionlin a yerticalplane of one .of the improved Scrapers as loaded and with the load elevated for trans' portation. Fig. 4 shows the scraper inthe act of dumping the load. Fig. 5 is-a plan viewillustrating. conventionally the hydraulic lifting jack and the apparatus for supplying it with liquid under pressure, and

releasing the same.

described is In the drawing, the numeral 5 denotes a tractor ofthe creeper type, provided at its rear with-a draw-barA plate 6. The tractor is also supposed to carry an oil-tank 7 and a pressure pump 8 for the same, not shown in Figs. 1 or 2, but clearly indicated in Fig. 5. y This is a part of the regular equipment of the tractor partly illustrated, t el tractor supplying the necessary power for.`

operating the ump.l The scraper now tovbe esigned for attachment to. a

tractor capable of supplying liquid under pressure to a hydraulic jack, whetherv of this, or other general type. h

A pair of strong, broad-tired wheels 9 is provided with an axle 10, and on thisisI hung a strong steel frame to support the scraperand its-o erating mechanism. The

frame as herein s own comprises a -pair of "sure of excavating.l

An arched bri ge connects the scoop `v tending coupler head is formedoof two top and bottom plates 16 secured to the frame' sills, and has a rear block'17 holding the,

swiveled coupler 18. Draw-bars 19 serve Ito link any desired number of the Scrapers in atrain and tothe-operating tractor. The rear corners of the. frame are provided with posts 20, suitably braced, and to these the supporting arms 21 of the Scraper, 22, are. pivoted. .The scraper 22 is. in the nature of a scoop, substantially rectangular, and open at the top and front. This. is riveted to the .sidearms and to a connectin cross-bar 23,

which'is also suitably brace The bottom of the scoop, 24, is hinged to the sides at or s'r. Louis, irrssouitn assIe'Non. 'ro LA 'PLANT-encara MANU- i racrunme co., or Ganan. Burns', rows.

25 by its upturned sides 24. Normally it is held in closed position by links 26 sliding in pivoted guides 27, which are slotted at 28 for the movement of Studs 29. These serve to limit the swing of the bottom'v in dumping, and when in normal position are lheld by hooks 30 attached to a"'rockshaft 31 mounted in bearings .32 at the back of the scoop. A hand lever 33 serves for disengaging the hook's. to dump theload, and a S 'ring 34 restores them to engaging position. The hooking of the bottom inworking position is automatic. When the scoop is depressed the bottom, restin on, the .y ground, is brought to nearly fina plosition, and is forced to Such position by t e pres-pl arms, and to lugs 36 pivoted'the piston` Vrofl 37 of a hydraulic jack 38. --This haslateral trunnions 39 mounted in bearings 40 on the beams 15. Liquid forcedowerfully into lthe bottom end of the jac -cylinder carries the internal piston upwardly, and so-elevates the scoop, as shown in Fig. 3. The referred lliquid -for the jack /is oil,` anda simple manner of applying it is shown in Fig. 5.- A sulicient supp y of oil 1s held ina tank 7 on the tractor, as above men-v tioned.y A pipe 42 leads from this to a force-pump 8, having connection with a.

pipe-line consisting of a pressure-pipe 44 and a pressure-limiting by-pass 45. The latter is provided with a suitable valve 46, which permits the liquid to -ilow back to the tank when the pressure from the pump exceeds a predetermined limit. A return pipe 47 restores the oil used by the jack to the tank. The circulation is carried to any number of scrapers byfpiping each scraper, the pipes being shown as conveniently disposed in the channels of the frame sills. The ends of the pipes, front and rear, are preferably brought near the couplings (to facilitate turning), and are provided with iexible terminals 49, with their couplings 50. Each line pipe is also provided with a valve 5l, whereby the flow of oil may be stopped at the rear of any scraper. If a train of them is employed, only the rearmost valves are closed. Each jack. connects with a three-way valve 52 by a hose 53, and the valve connects with the pressure and release pipes by branches 54 and 55, respectively. Pressure is -maintained inthe one line by the continuous action of the pump, and a turn of the three-way valve delivers the pressure to the jack to lift the scoop. A reverse turn releases the oil into the return pipe, and the parts ,descend by gravity. Both the valve lever and the load-dumping lever are within easy access of the operator, who is supposed to stand on the platform made by the rearrcoupling head.

` The natural order in loading and operating the scoops in a train is from front to rear, but the apparatus admits of the operationy in any desired order. Itfis also to be noted that by moving the three-way valve back and forth more or less rapidly the scoop will be vibrated up and3 down, and thus be` shaken vfree from anymaterial inclining tostick to it.

The quick lift of the jack-makes it possible to load and elevate the scoops witht no slowing lor stopping of the tractor, and with a considerable train of Scrapers the rapid excavation of large masses of earth is accomplished, with little manual labor.

It will be evident that the whole thrust of the scraper while at work is borne by the rearwardlyextending arms rigidly secured to it near the top. The pivoting of the arms to the fra-me is such with relation to the cutting parts of the scraper, that the latter, as y it movesforwardly, is forced to dig, and --this actlon is very desirable, especially' in hard earth. Any excess, of tendency in this fI the hydraulic jack. The swing of the scoop isa simple arc, which is just the movement desired, as it brings' the scoop to the tiltedfcarrying position, and well elevated, so as to dump easily on a level or on a heap.

ananas-a Having thus described my invention, I claimz' 1. In a wheeled scraper, a iixed supporting frame, a scoo pivoted rearwardly thereto, a hydraulic ]ack carried by thel frame, and means connecting thej ack liftably withthe scoop.

2. In a wheeled scraper, a ixed supporting frame, a scoop having rearwardly extending arms pivotally connecting with the frame, a connecting bridge for said arms, a hydraulic jack carried by the frame, and means connecting the jack with said bridge.

3. In a wheeled scraper having a fixed supporting frame, thrust-arms pivoted rearwardly thereto, a'scoop rigidly attached to said arms, a hydraulic jack mounted rock- .ably on the frame, and a thrusting connection of its piston with said scoop. Y

4. In a wheeled scraper having a fixed supporting frame, thrust-arms pivoted rearwardly thereto, a scoop rigidly attached to said arms, a hydraulic jack mounted rockably on the frame below said arms, and having a thrusting connection of itsA piston with said scoop.

5. In a wheeled scraper having a `fixed supporting frame,-thrustarms pivoted rearwardly thereto, a scooprigidly attached to said arms, a hydraulic jack mounted below said `arms and having a thrusting connection of its piston with said scoop, and pipes carried by the frame and adapted to supply liquid under pressure to said jack. l

6. In a wheeled scraper having a supporting frame, a tilting scoop mounted thereon, and a hydraulic jack connecting operably with said scoop, a liquid-pressure plpe carried by the frame, frontand rear flexible extensions thereof, .means for coupling them in a train, and valved pipes leading from the main line'to said jack.A

7 In a wheeled scraper having a supporting frame, a tilting scoop carried thereby, a

lifting hydraulic jack connecting operablyV `with said scoop, a liquid-pressure pipe carto close the pressure line, at the rear.

9. In a wheeled scraper, a supporting frame, a tilting scoop carried thereby, a forwardlyhinged bottom for said scoop, rearwardly connecting links therefor, hooks to engage the Ylinks in operative position, a

with the source of pressure at the front, and direction can be-easily controlled by the lift i rock-shaft carrying said h ooks,- and a releasingllever attached to sald shaft.

`10. In a wheeled scraper, a. supporting to limit the dropthereof, hooks to enga e said links in the su porting position,`

frame, a scoop carried by rearwardly exan means for manual y 'releasing said 5 tending arms pivoted to the frame, a dum hooks. I

ing bottom for the scoop pivotedforwar y In testimony whereof I aix my signaand at a point higher than itsA cutting edge ture.

when working, rearward links adapted to FREDRICK G. LEWIS. 

